A lot of the things that people wish they'd purchased can either be bought in supermarkets (Easter eggs) or ordered for delivery, including clippers for cutting men's hair, hairdressing scissors for trimming women's hair, hair dye, paint, top soil, plants, etc. There are YouTube videos for how to do all kinds of jobs around the house, so figure out what you need and see if you can order it and do it yourself.
I'm so glad that DH and I realised that we were about to go into lockdown a week before it happened. We went to the garden centre and stocked up and I moved my hairdresser visit to last Friday - just before the salons closed. My poor dad though, 77 and with underlying conditions, didn't manage to get to the barbers so he'll probably look like Tom Hanks in Castaway after three months!